/**
 * Copyright (c) 2005-2012 springside.org.cn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 */
package com.cnksi.core.tools.utils;

import java.io.PrintWriter;
import java.io.StringWriter;

/**
 * 关于异常的工具类.
 * 
 * @author calvin
 */
public class Exceptions
{

	/**
	 * 将CheckedException转换为UncheckedException.
	 */
	public static RuntimeException unchecked(Exception e)
	{
		if (e instanceof RuntimeException)
		{
			return (RuntimeException) e;
		} else
		{
			return new RuntimeException(e);
		}
	}

	/**
	 * 将ErrorStack转化为String.
	 */
	public static String getStackTraceAsString(Exception e)
	{
		StringWriter stringWriter = new StringWriter();
		e.printStackTrace(new PrintWriter(stringWriter));
		return stringWriter.toString();
	}

	/**
	 * 判断异常是否由某些底层的异常引起.
	 */
	@SuppressWarnings("all")
	public static boolean isCausedBy(Exception ex, Class<? extends Exception>... causeExceptionClasses)
	{
		Throwable cause = ex.getCause();
		while (cause != null)
		{
			for (Class<? extends Exception> causeClass : causeExceptionClasses)
			{
				if (causeClass.isInstance(cause))
				{
					return true;
				}
			}
			cause = cause.getCause();
		}
		return false;
	}
}
